RealTerm - RealTerm is a terminal program specially designed for capturing, controlling and debugging binary...
minicom - Minicom is a menu driven communications program. It emulates ANSI and VT102 terminals.
GtkTerm - Gtkterm is a simple GTK+ terminal used to communicate with a serial port.
HTerm - HTerm is a terminal emulator for serial communication.
CuteCom - Features: easy to use GUI no cryptic keyboard shortcuts
PuTTY - Popular free terminal application. Mostly used as an SSH client.